{"id":38728,"date":"2019-10-31T22:25:33","date_gmt":"2019-10-31T19:25:33","guid":{"rendered":"https:\/\/prohoster.info\/blog\/poddelnye-ds18b20-waterproof-chto-delat\/"},"modified":"2019-10-31T22:25:33","modified_gmt":"2019-10-31T19:25:33","slug":"poddelnye-ds18b20-waterproof-chto-delat","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/poddelnye-ds18b20-waterproof-chto-delat","title":{"rendered":"Falske DS18B20 waterproof: hvad skal man g\u00f8re?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

God eftermiddag! Denne artikel beskriver problemet med falske sensorer, begr\u00e6nsningerne ved eksisterende enheder, der bruger disse sensorer, og l\u00f8sningen p\u00e5 dette problem.<\/p>\n

\"Falske
\nKilde: ali-trends.ru<\/i><\/p>\n

Tidligere har der ogs\u00e5 v\u00e6ret skrevet om falske sensorer her<\/a><\/noindex>. Karakteristiske forskelle mellem falske sensorer og originale:<\/p>\n

    \n
  1. Sensoren, selv n\u00e5r den er tilsluttet i n\u00e6rheden, reagerer usikkert i parasitisk str\u00f8mforsyning, kun ind imellem.<\/li>\n
  2. I parasitisk str\u00f8mforsyning genoprettes det h\u00f8je niveau for langsomt (man kan m\u00e5le med en mikrocontroller eller se p\u00e5 oscilloskopet)<\/li>\n
  3. str\u00f8mforbruget er betydeligt h\u00f8jere end nogle mikroampere (GND og VCC til minus, DQ gennem en mikroampere meter til +5 volt)<\/li>\n
  4. Efter proceduren for opregning (0xF0) svarer sensorerne ikke p\u00e5 l\u00e6sekommandoen til skratches (0xBE)<\/li>\n
  5. Temperaturen l\u00e6st fra scratchpad efter str\u00f8mtilf\u00f8rsel uden m\u00e5lekommando adskiller sig fra 85,0 grader.<\/li>\n
  6. V\u00e6rdierne i scratchpad p\u00e5 positionerne 5 og 7 svarer ikke til 0xFF og 0x10<\/li>\n
  7. Temperaturv\u00e6rdierne (p\u00e5 de f\u00f8rste to positioner i scratchpad) l\u00e6st efter den f\u00f8rste t\u00e6nding af den deaktiverede sensor uden en forudg\u00e5ende m\u00e5lekommando returnerer den tidligere v\u00e6rdi, ikke 50 05 (85,0 grader).<\/li>\n<\/ol>\n

    \n<\/a><\/noindex>
    \nDesv\u00e6rre har jeg ikke et oscilloskop, og den testplatform, der blev brugt, var GPS-tracker Galileosky BaseBlock Lite. <\/p>\n

    Sensorerne blev indk\u00f8bt fra forskellige s\u00e6lgere, og kun \u00e9n part fungerede med parasitisk str\u00f8mforsyning. I alt blev der k\u00f8bt 5 partier \u00e1 50 stykker.
    \nDe \u00f8vrige fungerede slet ikke med parasitisk str\u00f8mforsyning. Terminalen forudser ikke ekstern str\u00f8mforsyning til sensoren, og installationen af systemet i bilen skal maksimeres for enkelhed.<\/p>\n

    L\u00f8sning p\u00e5 problemet<\/h2>\n

    \nS\u00e5 sensorerne er indk\u00f8bt, men kun \u00e9n part fungerede korrekt, og det ville tage en betydelig tid at unders\u00f8ge sagen og bestille en ny part, hvilket ogs\u00e5 ville medf\u00f8re un\u00f8dvendige omkostninger. Derfor m\u00e5tte vi l\u00f8se problemet selv.<\/p>\n

    Da kun et to-tr\u00e5dsystem anvendes, er det n\u00f8dvendigt at organisere str\u00f8mforsyningen til sensoren fra signallederen, dvs. at organisere parasitisk str\u00f8mforsyning. Jeg organiserede parasitisk str\u00f8mforsyning if\u00f8lge f\u00f8lgende skema:<\/p>\n

    \"Falske
    \n
    \nI dette schema er den parasit\u00e6re str\u00f8mforsyning forbedret, men der er stadig mulighed for at tilslutte ekstern str\u00f8mforsyning. Samtidig \u00e6ndres tilslutningsskemaet en smule: ved tilslutning via parasit\u00e6r str\u00f8mforsyning \u00e6ndres Vcc-lederen. ikke i brug<\/u>.<\/p>\n

    Efter samling af kredsl\u00f8bet med overflademonterede komponenter blev sensoren detekteret af terminalen med en kapacitans p\u00e5 1 \u00b5F. Til masseproduktion blev der designet og bestilt paneler med parasit\u00e6re str\u00f8mbord.<\/p>\n

    \"Falske
    \n
    \nEt interessant punkt:<\/b> til forsegling af sensoren kan producenterne bruge termisk lim eller silikone. I det f\u00f8rste tilf\u00e6lde kan man opvarme kappen, fjerne sensoren, introducere printpladen, returnere den til kappen og h\u00e6lde termisk lim igen. I det andet tilf\u00e6lde er det ikke muligt, og man m\u00e5tte lodde printpladen t\u00e6t p\u00e5 sensoren, h\u00e6lde termisk lim og s\u00e6tte krympeplast p\u00e5; resultatet ser s\u00e5dan ud:<\/p>\n

    \"Falske
    \n<\/p>\n

    Konklusion<\/h2>\n

    \nHer vil jeg gerne opfordre producenterne af enheder til at tage dette i betragtning i deres produkter, og s\u00e6lgerne til at teste sensorerne f\u00f8r salg eller overhovedet ikke have at g\u00f8re med leverand\u00f8rer, der leverer falske sensorer; og brugerne til at belyse dette emne i kommentarer, breve eller henvendelser.
    \n
    Kilde:     habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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